Embedded HTML5 viewer does not honor enter key using Internet Explorer

We have embedded the HTML5 viewer (v1.2.1) into a web page using an iFrame folllowing the example set in the demo/example 'Service Request Reporter' site. 

Firefox and Chrome appear to honor the enter key initiating the search, but Internet Explorer does not, while the map is embedded.

When the viewer is running stand alone, not embedded in an iFrame, the enter key initiates a search using Internet Explorer.

http://penniesforprogress.net/interactiveMaps